Translation guide
The stoat is a small carnivorous mammal native to Eurasia and North America. In Japanese, it is most commonly referred to as オコジョ, but regional and literary terms exist.
Refer to the stoat as an animal in everyday conversation or writing.
The most common and widely understood term for stoat in modern Japanese. Used in zoos, nature documentaries, and general conversation.
I saw a stoat in Hokkaido.
Literally 'white weasel'. A less common term, sometimes used in literature or older texts. May be confused with other white weasels.
The stoat's fur turns white in winter.
Specifically refer to the stoat when it has its white winter fur, often associated with fur coats or heraldry.
Unless you are specifically talking about fur or heraldry, オコジョ is the best word to use for stoat in Japanese. It is widely recognized and used in media.
王のマントには白貂の毛皮が使われていた。
The king's mantle was trimmed with ermine fur.